enlarged nipples

I was punched in the nipples by someone about 9 months ago (long story) any way since then i feel like lumps behind my nipples and they were once small and pointed nicely and now I look like a girl entering puberty. At times they are painful but they are very noticeable! One is larger than the other one, I think that I was hit there the hardest, so I think it might stem from the punches? I need to know if I could have injured something there that would cause these symptoms?

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